/*!
 * mustache.js - Logic-less {{mustache}} templates with JavaScript
 * http://github.com/janl/mustache.js
 */

/*global define: false Mustache: true*/

(function defineMustache (global, factory) {
    if (typeof exports === 'object' && exports && typeof exports.nodeName !== 'string') {
      factory(exports); // CommonJS
    } else if (typeof define === 'function' && define.amd) {
      define(['exports'], factory); // AMD
    } else {
      global.Mustache = {};
      factory(global.Mustache); // script, wsh, asp
    }
  }(this, function mustacheFactory (mustache) {
  
    var objectToString = Object.prototype.toString;
    var isArray = Array.isArray || function isArrayPolyfill (object) {
      return objectToString.call(object) === '[object Array]';
    };
  
    function isFunction (object) {
      return typeof object === 'function';
    }
  
    /**
     * More correct typeof string handling array
     * which normally returns typeof 'object'
     */
    function typeStr (obj) {
      return isArray(obj) ? 'array' : typeof obj;
    }
  
    function escapeRegExp (string) {
      return string.replace(/[\-\[\]{}()*+?.,\\\^$|#\s]/g, '\\$&');
    }
  
    /**
     * Null safe way of checking whether or not an object,
     * including its prototype, has a given property
     */
    function hasProperty (obj, propName) {
      return obj != null && typeof obj === 'object' && (propName in obj);
    }
  
    /**
     * Safe way of detecting whether or not the given thing is a primitive and
     * whether it has the given property
     */
    function primitiveHasOwnProperty (primitive, propName) {  
      return (
        primitive != null
        && typeof primitive !== 'object'
        && primitive.hasOwnProperty
        && primitive.hasOwnProperty(propName)
      );
    }
  
    // Workaround for https://issues.apache.org/jira/browse/COUCHDB-577
    // See https://github.com/janl/mustache.js/issues/189
    var regExpTest = RegExp.prototype.test;
    function testRegExp (re, string) {
      return regExpTest.call(re, string);
    }
  
    var nonSpaceRe = /\S/;
    function isWhitespace (string) {
      return !testRegExp(nonSpaceRe, string);
    }
  
    var entityMap = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#39;',
      '/': '&#x2F;',
      '`': '&#x60;',
      '=': '&#x3D;'
    };
  
    function escapeHtml (string) {
      return String(string).replace(/[&<>"'`=\/]/g, function fromEntityMap (s) {
        return entityMap[s];
      });
    }
  
    var whiteRe = /\s*/;
    var spaceRe = /\s+/;
    var equalsRe = /\s*=/;
    var curlyRe = /\s*\}/;
    var tagRe = /#|\^|\/|>|\{|&|=|!/;
  
    /**
     * Breaks up the given `template` string into a tree of tokens. If the `tags`
     * argument is given here it must be an array with two string values: the
     * opening and closing tags used in the template (e.g. [ "<%", "%>" ]). Of
     * course, the default is to use mustaches (i.e. mustache.tags).
     *
     * A token is an array with at least 4 elements. The first element is the
     * mustache symbol that was used inside the tag, e.g. "#" or "&". If the tag
     * did not contain a symbol (i.e. {{myValue}}) this element is "name". For
     * all text that appears outside a symbol this element is "text".
     *
     * The second element of a token is its "value". For mustache tags this is
     * whatever else was inside the tag besides the opening symbol. For text tokens
     * this is the text itself.
     *
     * The third and fourth elements of the token are the start and end indices,
     * respectively, of the token in the original template.
     *
     * Tokens that are the root node of a subtree contain two more elements: 1) an
     * array of tokens in the subtree and 2) the index in the original template at
     * which the closing tag for that section begins.
     */
    function parseTemplate (template, tags) {
      if (!template)
        return [];
  
      var sections = [];     // Stack to hold section tokens
      var tokens = [];       // Buffer to hold the tokens
      var spaces = [];       // Indices of whitespace tokens on the current line
      var hasTag = false;    // Is there a {{tag}} on the current line?
      var nonSpace = false;  // Is there a non-space char on the current line?
  
      // Strips all whitespace tokens array for the current line
      // if there was a {{#tag}} on it and otherwise only space.
      function stripSpace () {
        if (hasTag && !nonSpace) {
          while (spaces.length)
            delete tokens[spaces.pop()];
        } else {
          spaces = [];
        }
  
        hasTag = false;
        nonSpace = false;
      }
  
      var openingTagRe, closingTagRe, closingCurlyRe;
      function compileTags (tagsToCompile) {
        if (typeof tagsToCompile === 'string')
          tagsToCompile = tagsToCompile.split(spaceRe, 2);
  
        if (!isArray(tagsToCompile) || tagsToCompile.length !== 2)
          throw new Error('Invalid tags: ' + tagsToCompile);
  
        openingTagRe = new RegExp(escapeRegExp(tagsToCompile[0]) + '\\s*');
        closingTagRe = new RegExp('\\s*' + escapeRegExp(tagsToCompile[1]));
        closingCurlyRe = new RegExp('\\s*' + escapeRegExp('}' + tagsToCompile[1]));
      }
  
      compileTags(tags || mustache.tags);
  
      var scanner = new Scanner(template);
  
      var start, type, value, chr, token, openSection;
      while (!scanner.eos()) {
        start = scanner.pos;
  
        // Match any text between tags.
        value = scanner.scanUntil(openingTagRe);
  
        if (value) {
          for (var i = 0, valueLength = value.length; i < valueLength; ++i) {
            chr = value.charAt(i);
  
            if (isWhitespace(chr)) {
              spaces.push(tokens.length);
            } else {
              nonSpace = true;
            }
  
            tokens.push([ 'text', chr, start, start + 1 ]);
            start += 1;
  
            // Check for whitespace on the current line.
            if (chr === '\n')
              stripSpace();
          }
        }
  
        // Match the opening tag.
        if (!scanner.scan(openingTagRe))
          break;
  
        hasTag = true;
  
        // Get the tag type.
        type = scanner.scan(tagRe) || 'name';
        scanner.scan(whiteRe);
  
        // Get the tag value.
        if (type === '=') {
          value = scanner.scanUntil(equalsRe);
          scanner.scan(equalsRe);
          scanner.scanUntil(closingTagRe);
        } else if (type === '{') {
          value = scanner.scanUntil(closingCurlyRe);
          scanner.scan(curlyRe);
          scanner.scanUntil(closingTagRe);
          type = '&';
        } else {
          value = scanner.scanUntil(closingTagRe);
        }
  
        // Match the closing tag.
        if (!scanner.scan(closingTagRe))
          throw new Error('Unclosed tag at ' + scanner.pos);
  
        token = [ type, value, start, scanner.pos ];
        tokens.push(token);
  
        if (type === '#' || type === '^') {
          sections.push(token);
        } else if (type === '/') {
          // Check section nesting.
          openSection = sections.pop();
  
          if (!openSection)
            throw new Error('Unopened section "' + value + '" at ' + start);
  
          if (openSection[1] !== value)
            throw new Error('Unclosed section "' + openSection[1] + '" at ' + start);
        } else if (type === 'name' || type === '{' || type === '&') {
          nonSpace = true;
        } else if (type === '=') {
          // Set the tags for the next time around.
          compileTags(value);
        }
      }
  
      // Make sure there are no open sections when we're done.
      openSection = sections.pop();
  
      if (openSection)
        throw new Error('Unclosed section "' + openSection[1] + '" at ' + scanner.pos);
  
      return nestTokens(squashTokens(tokens));
    }
  
    /**
     * Combines the values of consecutive text tokens in the given `tokens` array
     * to a single token.
     */
    function squashTokens (tokens) {
      var squashedTokens = [];
  
      var token, lastToken;
      for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) {
        token = tokens[i];
  
        if (token) {
          if (token[0] === 'text' && lastToken && lastToken[0] === 'text') {
            lastToken[1] += token[1];
            lastToken[3] = token[3];
          } else {
            squashedTokens.push(token);
            lastToken = token;
          }
        }
      }
  
      return squashedTokens;
    }
  
    /**
     * Forms the given array of `tokens` into a nested tree structure where
     * tokens that represent a section have two additional items: 1) an array of
     * all tokens that appear in that section and 2) the index in the original
     * template that represents the end of that section.
     */
    function nestTokens (tokens) {
      var nestedTokens = [];
      var collector = nestedTokens;
      var sections = [];
  
      var token, section;
      for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) {
        token = tokens[i];
  
        switch (token[0]) {
          case '#':
          case '^':
            collector.push(token);
            sections.push(token);
            collector = token[4] = [];
            break;
          case '/':
            section = sections.pop();
            section[5] = token[2];
            collector = sections.length > 0 ? sections[sections.length - 1][4] : nestedTokens;
            break;
          default:
            collector.push(token);
        }
      }
  
      return nestedTokens;
    }
  
    /**
     * A simple string scanner that is used by the template parser to find
     * tokens in template strings.
     */
    function Scanner (string) {
      this.string = string;
      this.tail = string;
      this.pos = 0;
    }
  
    /**
     * Returns `true` if the tail is empty (end of string).
     */
    Scanner.prototype.eos = function eos () {
      return this.tail === '';
    };
  
    /**
     * Tries to match the given regular expression at the current position.
     * Returns the matched text if it can match, the empty string otherwise.
     */
    Scanner.prototype.scan = function scan (re) {
      var match = this.tail.match(re);
  
      if (!match || match.index !== 0)
        return '';
  
      var string = match[0];
  
      this.tail = this.tail.substring(string.length);
      this.pos += string.length;
  
      return string;
    };
  
    /**
     * Skips all text until the given regular expression can be matched. Returns
     * the skipped string, which is the entire tail if no match can be made.
     */
    Scanner.prototype.scanUntil = function scanUntil (re) {
      var index = this.tail.search(re), match;
  
      switch (index) {
        case -1:
          match = this.tail;
          this.tail = '';
          break;
        case 0:
          match = '';
          break;
        default:
          match = this.tail.substring(0, index);
          this.tail = this.tail.substring(index);
      }
  
      this.pos += match.length;
  
      return match;
    };
  
    /**
     * Represents a rendering context by wrapping a view object and
     * maintaining a reference to the parent context.
     */
    function Context (view, parentContext) {
      this.view = view;
      this.cache = { '.': this.view };
      this.parent = parentContext;
    }
  
    /**
     * Creates a new context using the given view with this context
     * as the parent.
     */
    Context.prototype.push = function push (view) {
      return new Context(view, this);
    };
  
    /**
     * Returns the value of the given name in this context, traversing
     * up the context hierarchy if the value is absent in this context's view.
     */
    Context.prototype.lookup = function lookup (name) {
      var cache = this.cache;
  
      var value;
      if (cache.hasOwnProperty(name)) {
        value = cache[name];
      } else {
        var context = this, intermediateValue, names, index, lookupHit = false;
  
        while (context) {
          if (name.indexOf('.') > 0) {
            intermediateValue = context.view;
            names = name.split('.');
            index = 0;
  
            /**
             * Using the dot notion path in `name`, we descend through the
             * nested objects.
             *
             * To be certain that the lookup has been successful, we have to
             * check if the last object in the path actually has the property
             * we are looking for. We store the result in `lookupHit`.
             *
             * This is specially necessary for when the value has been set to
             * `undefined` and we want to avoid looking up parent contexts.
             *
             * In the case where dot notation is used, we consider the lookup
             * to be successful even if the last "object" in the path is
             * not actually an object but a primitive (e.g., a string, or an
             * integer), because it is sometimes useful to access a property
             * of an autoboxed primitive, such as the length of a string.
             **/
            while (intermediateValue != null && index < names.length) {
              if (index === names.length - 1)
                lookupHit = (
                  hasProperty(intermediateValue, names[index]) 
                  || primitiveHasOwnProperty(intermediateValue, names[index])
                );
  
              intermediateValue = intermediateValue[names[index++]];
            }
          } else {
            intermediateValue = context.view[name];
  
            /**
             * Only checking against `hasProperty`, which always returns `false` if
             * `context.view` is not an object. Deliberately omitting the check
             * against `primitiveHasOwnProperty` if dot notation is not used.
             *
             * Consider this example:
             * ```
             * Mustache.render("The length of a football field is {{#length}}{{length}}{{/length}}.", {length: "100 yards"})
             * ```
             *
             * If we were to check also against `primitiveHasOwnProperty`, as we do
             * in the dot notation case, then render call would return:
             *
             * "The length of a football field is 9."
             *
             * rather than the expected:
             *
             * "The length of a football field is 100 yards."
             **/
            lookupHit = hasProperty(context.view, name);
          }
  
          if (lookupHit) {
            value = intermediateValue;
            break;
          }
  
          context = context.parent;
        }
  
        cache[name] = value;
      }
  
      if (isFunction(value))
        value = value.call(this.view);
  
      return value;
    };
  
    /**
     * A Writer knows how to take a stream of tokens and render them to a
     * string, given a context. It also maintains a cache of templates to
     * avoid the need to parse the same template twice.
     */
    function Writer () {
      this.cache = {};
    }
  
    /**
     * Clears all cached templates in this writer.
     */
    Writer.prototype.clearCache = function clearCache () {
      this.cache = {};
    };
  
    /**
     * Parses and caches the given `template` according to the given `tags` or
     * `mustache.tags` if `tags` is omitted,  and returns the array of tokens
     * that is generated from the parse.
     */
    Writer.prototype.parse = function parse (template, tags) {
      var cache = this.cache;
      var cacheKey = template + ':' + (tags || mustache.tags).join(':');
      var tokens = cache[cacheKey];
  
      if (tokens == null)
        tokens = cache[cacheKey] = parseTemplate(template, tags);
  
      return tokens;
    };
  
    /**
     * High-level method that is used to render the given `template` with
     * the given `view`.
     *
     * The optional `partials` argument may be an object that contains the
     * names and templates of partials that are used in the template. It may
     * also be a function that is used to load partial templates on the fly
     * that takes a single argument: the name of the partial.
     *
     * If the optional `tags` argument is given here it must be an array with two
     * string values: the opening and closing tags used in the template (e.g.
     * [ "<%", "%>" ]). The default is to mustache.tags.
     */
    Writer.prototype.render = function render (template, view, partials, tags) {
      var tokens = this.parse(template, tags);
      var context = (view instanceof Context) ? view : new Context(view);
      return this.renderTokens(tokens, context, partials, template, tags);
    };
  
    /**
     * Low-level method that renders the given array of `tokens` using
     * the given `context` and `partials`.
     *
     * Note: The `originalTemplate` is only ever used to extract the portion
     * of the original template that was contained in a higher-order section.
     * If the template doesn't use higher-order sections, this argument may
     * be omitted.
     */
    Writer.prototype.renderTokens = function renderTokens (tokens, context, partials, originalTemplate, tags) {
      var buffer = '';
  
      var token, symbol, value;
      for (var i = 0, numTokens = tokens.length; i < numTokens; ++i) {
        value = undefined;
        token = tokens[i];
        symbol = token[0];
  
        if (symbol === '#') value = this.renderSection(token, context, partials, originalTemplate);
        else if (symbol === '^') value = this.renderInverted(token, context, partials, originalTemplate);
        else if (symbol === '>') value = this.renderPartial(token, context, partials, tags);
        else if (symbol === '&') value = this.unescapedValue(token, context);
        else if (symbol === 'name') value = this.escapedValue(token, context);
        else if (symbol === 'text') value = this.rawValue(token);
  
        if (value !== undefined)
          buffer += value;
      }
  
      return buffer;
    };
  
    Writer.prototype.renderSection = function renderSection (token, context, partials, originalTemplate) {
      var self = this;
      var buffer = '';
      var value = context.lookup(token[1]);
  
      // This function is used to render an arbitrary template
      // in the current context by higher-order sections.
      function subRender (template) {
        return self.render(template, context, partials);
      }
  
      if (!value) return;
  
      if (isArray(value)) {
        for (var j = 0, valueLength = value.length; j < valueLength; ++j) {
          buffer += this.renderTokens(token[4], context.push(value[j]), partials, originalTemplate);
        }
      } else if (typeof value === 'object' || typeof value === 'string' || typeof value === 'number') {
        buffer += this.renderTokens(token[4], context.push(value), partials, originalTemplate);
      } else if (isFunction(value)) {
        if (typeof originalTemplate !== 'string')
          throw new Error('Cannot use higher-order sections without the original template');
  
        // Extract the portion of the original template that the section contains.
        value = value.call(context.view, originalTemplate.slice(token[3], token[5]), subRender);
  
        if (value != null)
          buffer += value;
      } else {
        buffer += this.renderTokens(token[4], context, partials, originalTemplate);
      }
      return buffer;
    };
  
    Writer.prototype.renderInverted = function renderInverted (token, context, partials, originalTemplate) {
      var value = context.lookup(token[1]);
  
      // Use JavaScript's definition of falsy. Include empty arrays.
      // See https://github.com/janl/mustache.js/issues/186
      if (!value || (isArray(value) && value.length === 0))
        return this.renderTokens(token[4], context, partials, originalTemplate);
    };
  
    Writer.prototype.renderPartial = function renderPartial (token, context, partials, tags) {
      if (!partials) return;
  
      var value = isFunction(partials) ? partials(token[1]) : partials[token[1]];
      if (value != null)
        return this.renderTokens(this.parse(value, tags), context, partials, value);
    };
  
    Writer.prototype.unescapedValue = function unescapedValue (token, context) {
      var value = context.lookup(token[1]);
      if (value != null)
        return value;
    };
  
    Writer.prototype.escapedValue = function escapedValue (token, context) {
      var value = context.lookup(token[1]);
      if (value != null)
        return mustache.escape(value);
    };
  
    Writer.prototype.rawValue = function rawValue (token) {
      return token[1];
    };
  
    mustache.name = 'mustache.js';
    mustache.version = '3.0.1';
    mustache.tags = [ '{{', '}}' ];
  
    // All high-level mustache.* functions use this writer.
    var defaultWriter = new Writer();
  
    /**
     * Clears all cached templates in the default writer.
     */
    mustache.clearCache = function clearCache () {
      return defaultWriter.clearCache();
    };
  
    /**
     * Parses and caches the given template in the default writer and returns the
     * array of tokens it contains. Doing this ahead of time avoids the need to
     * parse templates on the fly as they are rendered.
     */
    mustache.parse = function parse (template, tags) {
      return defaultWriter.parse(template, tags);
    };
  
    /**
     * Renders the `template` with the given `view` and `partials` using the
     * default writer. If the optional `tags` argument is given here it must be an
     * array with two string values: the opening and closing tags used in the
     * template (e.g. [ "<%", "%>" ]). The default is to mustache.tags.
     */
    mustache.render = function render (template, view, partials, tags) {
      if (typeof template !== 'string') {
        throw new TypeError('Invalid template! Template should be a "string" ' +
                            'but "' + typeStr(template) + '" was given as the first ' +
                            'argument for mustache#render(template, view, partials)');
      }
  
      return defaultWriter.render(template, view, partials, tags);
    };
  
    // This is here for backwards compatibility with 0.4.x.,
    /*eslint-disable */ // eslint wants camel cased function name
    mustache.to_html = function to_html (template, view, partials, send) {
      /*eslint-enable*/
  
      var result = mustache.render(template, view, partials);
  
      if (isFunction(send)) {
        send(result);
      } else {
        return result;
      }
    };
  
    // Export the escaping function so that the user may override it.
    // See https://github.com/janl/mustache.js/issues/244
    mustache.escape = escapeHtml;
  
    // Export these mainly for testing, but also for advanced usage.
    mustache.Scanner = Scanner;
    mustache.Context = Context;
    mustache.Writer = Writer;
  
    return mustache;
  }));